const sqlite3 = require('sqlite3');
const { open } = require('sqlite');
const fetch = require('node-fetch'); // Native fetch in Node 18, but let's be safe or use global fetch
// Node 18 has global fetch, so we don't need node-fetch if running with node 18

const SERVICES = [
    { name: 'Website', url: 'https://www.akkolli.net' },
    { name: 'Gitea', url: 'https://code.akkolli.net' },
    { name: 'Nextcloud', url: 'http://localhost:6060' },
];

async function monitor() {
    console.log('Starting monitoring loop...');

    const db = await open({
        filename: './dashboard.db',
        driver: sqlite3.Database
    });

    // Ensure table exists (in case monitor runs before app)
    await db.exec(`
    CREATE TABLE IF NOT EXISTS uptime_logs (
      id INTEGER PRIMARY KEY AUTOINCREMENT,
      service_name TEXT NOT NULL,
      url TEXT NOT NULL,
      status TEXT NOT NULL,
      latency INTEGER,
      timestamp DATETIME DEFAULT CURRENT_TIMESTAMP
    );
  `);

    setInterval(async () => {
        console.log('Running checks...');
        const now = new Date().toISOString();

        for (const service of SERVICES) {
            const start = performance.now();
            let status = 'down';
            let latency = 0;

            try {
                const controller = new AbortController();
                const timeout = setTimeout(() => controller.abort(), 5000);

                const res = await fetch(service.url, {
                    method: 'HEAD',
                    signal: controller.signal
                });
                clearTimeout(timeout);

                status = res.ok ? 'up' : 'down';
                const end = performance.now();
                latency = Math.round(end - start);
            } catch (err) {
                status = 'down';
                latency = 0;
                // console.error(`Failed to reach ${service.name}:`, err.message);
            }

            try {
                await db.run(
                    `INSERT INTO uptime_logs (service_name, url, status, latency, timestamp) VALUES (?, ?, ?, ?, ?)`,
                    service.name, service.url, status, latency, now
                );
            } catch (dbErr) {
                console.error('DB Write Error:', dbErr);
            }
        }

        // Prune old logs (keep 7 days)
        try {
            await db.run(`DELETE FROM uptime_logs WHERE timestamp < datetime('now', '-7 days')`);
        } catch (e) { }

    }, 60000); // Run every minute
}

monitor();